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A fuel supply and combustion chamber system for a portable power tool, such as, for example, a fastener-driving tool, wherein the fuel supply and combustion chamber system can utilize liquid or gaseous fuels. The fuel supply and combustion chamber system can comprise multiple combustion chambers for

A fuel supply and combustion chamber system for a portable power tool, such as, for example, a fastener-driving tool, wherein the fuel supply and combustion chamber system can utilize liquid or gaseous fuels. The fuel supply and combustion chamber system can comprise multiple combustion chambers for achieving predetermined combustion and power output characteristics. In addition, the fuel supply and combustion chamber system can utilize portioning valve structures for providing predetermined amounts of either a gaseous or liquid fuel into the portable power tool combustion chamber.

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1. A fuel supply and combustion chamber system for use within a power tool, comprising: a combustion chamber;a liquid fuel supply containing a supply of liquid fuel;a valve fluidically connected to said liquid fuel supply for dispensing a predetermined amount of said liquid fuel from said liquid fue

1. A fuel supply and combustion chamber system for use within a power tool, comprising: a combustion chamber;a liquid fuel supply containing a supply of liquid fuel;a valve fluidically connected to said liquid fuel supply for dispensing a predetermined amount of said liquid fuel from said liquid fuel supply;an evaporator fluidically connected at a first end portion thereof to said valve for converting said predetermined amount of said liquid fuel, dispensed by said valve, into a gaseous fuel, and fluidically connected at a second end portion thereof to said combustion chamber for supplying said gaseous fuel to said combustion chamber;a workpiece contact element operatively connected to said valve so as to cause said valve to dispense said predetermined amount of said liquid fuel from said liquid fuel supply when said workpiece contact element is disposed in contact with a workpiece;intake and exhaust valves operatively associated with said combustion chamber;an ignition device operatively associated with said combustion chamber; anda trigger mechanism, movably mounted upon said power tool and operatively connected to said ignition device and said intake and exhaust valves, so as to activate said ignition device in order to initiate combustion of said air-fuel mixture within said combustion chamber, and to move said intake and exhaust valves to CLOSED positions, when said trigger mechanism is actuated so as to initiate a power tool firing cycle. 2. A fuel supply and combustion chamber system for use within a power tool, comprising: a pre-combustion chamber;a main combustion chamber fluidically connected to said pre-combustion chamber;a fuel supply for supplying fuel into said pre-combustion chamber;a jet pump interposed between said fuel supply and an upstream end portion of said pre-combustion chamber for entraining air into said fuel supply so as to define an air-fuel mixture, having a predetermined stoichiometric ratio, to be introduced into said pre-combustion chamber;an intake valve interposed between said jet pump and said upstream end portion of said pre-combustion chamber, and movably disposed between first OPEN and second CLOSED positions;an orifice interposed between said pre-combustion chamber and said main combustion chamber for fluidically connecting said pre-combustion chamber to said main combustion chamber;an exhaust valve operatively associated with a downstream end of said main combustion chamber and movably disposed between first OPEN and second CLOSED positions; anda bypass valve interposed between said pre-combustion chamber and said main combustion chamber and movably disposed between first OPEN and second CLOSED positions such that when said bypass valve, said intake valve, and said exhaust valve are disposed at said first OPEN positions, an air-fuel mixture can flow into and through said pre-combustion chamber, through said bypass valve, through said main combustion chamber, and out through said exhaust valve so as to charge an air-fuel mixture into said pre-combustion and main combustion chambers as well as to scavenge exhaust combustion products out from said pre-combustion and main combustion chambers, while when said by-pass valve, said intake valve, and said exhaust valve are disposed at said CLOSED positions, said air-fuel mixture disposed within said pre-combustion and main combustion chambers is effectively trapped within said pre-combustion and main combustion chambers so as to be ready for ignition. 3. The fuel supply and combustion chamber system as set forth in claim 2, further comprising: a check valve operatively associated with said orifice interposed between said pre-combustion chamber and said main combustion chamber for controlling the fluidic connection of said pre-combustion chamber to said main combustion chamber when a relatively high predetermined pressure level is attained within said pre-combustion chamber during a combustion cycle. 4. The fuel supply and combustion chamber system as set forth in claim 2, wherein: said main combustion chamber is fluidically connected to a downstream end portion of said pre-combustion chamber. 5. A fuel supply and combustion chamber system for use within a power tool, comprising: a pre-combustion chamber;a main combustion chamber fluidically connected to said pre-combustion chamber;a pair of fuel supply dispensers fluidically connected respectively to said pre-combustion chamber and said main combustion chamber for supplying fuel into said pre-combustion chamber and said main combustion chamber;a pair of jet pumps respectively interposed between said pair of fuel supply dispensers and said pre-combustion and main combustion chambers for respectively entraining air into said fuel supplies from said pair of fuel supply dispensers so as to define air fuel mixtures to be introduced into said pre-combustion and main combustion chambers;an orifice interposed between said pre-combustion chamber and said main combustion chamber for fluidically connecting said pre-combustion chamber to said main combustion chamber;a pair of intake valves respectively interposed between said pair of jet pumps and upstream end portions of said pre-combustion and main combustion chambers, and movably disposed between first OPEN and second CLOSED positions; anda pair of exhaust valves respectively operatively associated with downstream end portions of said pre-combustion and main combustion chambers and movably disposed between first OPEN and second CLOSED positions, such that when said pair of intake valves and said pair exhaust valves are disposed at said first OPEN positions, air-fuel mixtures can flow through said pair of intake valves, into, through, and out from said pre-combustion chamber, said main combustion chamber, and said pair of exhaust valves, so as to charge air-fuel mixture into said pre-combustion and main combustion chambers as well as to scavenge exhaust combustion products out from said pre-combustion and main combustion chambers, while when said pair of intake valves and said pair of exhaust valves are disposed at said CLOSED positions, said air-fuel mixtures disposed within said pre-combustion and main combustion chambers are effectively trapped within said pre-combustion and main combustion chambers so as to be ready for ignition. 6. The fuel supply and combustion chamber system as set forth in claim 5, further comprising: a check valve operatively associated with said orifice interposed between said pre-combustion chamber and said main combustion chamber for controlling the fluidic connection of said pre-combustion chamber to said main combustion chamber when a relatively high predetermined pressure level is attained within said pre-combustion chamber during a combustion cycle. 7. The fuel supply and combustion chamber system as set forth in claim 5, wherein: said fuel supply and combustion chamber system comprises a hybrid system in that said pre-combustion chamber and said main combustion chamber are serially connected together by said orifice and yet are disposed parallel with respect to each other by said pair of fuel supply dispensers, said pair of jet pumps, said pair of intake valves, and said pair of exhaust valves. 8. The fuel supply and combustion chamber system as set forth in claim 5, wherein: said pre-combustion chamber is disposed atop said main combustion chamber. 9. The fuel supply and combustion chamber system as set forth in claim 1, wherein: said workpiece contact element is operatively connected to said valve by linkage mechanisms. 10. The fuel supply and combustion chamber system as set forth in claim 1, wherein: said trigger mechanism is operatively connected to said ignition device and said intake and exhaust valves by linkage mechanisms.